Someone here did a hub jackshaft that required him to cut the long screw completely off for chain clearance, and he simply drilled a new hole and used a long bolt and nut to clamp the cover.
Sorry I cannot find the thread. It was a 3 spd hub used as a friction drive geared trans.
I want to say it was Cannonball, but I cannot find a link
EDIT: Found the thread! Cannonball's abbynormal 3 spd
If more is better, then too much is just enough.
If you can't afford it, build it yourself.